316 Stainless Steel Buchner Funnel for organic or inorganic chemical synthesis. This funnel incorporates a removable, perforated plate that allows thorough manual cleaning and autoclaving. Since the plate is removable, yield is increased because internal supports that would trap product are eliminated. 240 grit electropolished surfaces are ideal for critical applications such as pharmaceutical filtration. 1/4 inch concave bottom and 1.75 inch (0.402in x 0.500in OD) outlet tube is common to both sizes.